Improvement in harrow-teeth



D. WATERBURY & F. MILLER.

Harrow-Teeth;

No. 197,703. Patented N ov.27, 1877.

INVENTOR ".FETERS. PHDXO-LITHOGRAPHER WASHING'ION a c UNITED STATEsPATENT OE IoE.

DANIEL WATERBURY AND FRANK MILLER, OF KALAMAZOO, MICHIGAN.

IMPROVEMENT IN. HARROW-TEETH.

Specification forming part of Letters Patent No. 197,703, dated November27, 1877; application filed November 20, 1877.

To all whom it may concern:

Be it known that we, DANIEL WATERBURY and FRANK MILLER, of Kalamazoo, inthe county of Kalamazoo and State of Michigan, have invented a new andvaluable Improvement in Harrow-Teeth; and we do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawings,making a part of this'specification, and to the letters and figures ofreference marked thereon.

In the drawing the figure represents a side view our invention.

The nature of our invention relates to that class of harrow-teeth whichare hinged to the frame, and have separate and independent springsacting thereon; and it consists in the construction and arrangement ofthe tooth and spring, as will be hereinafter more fully set forth.

The annexeddrawing, to which reference is made, fully illustrates ourinvention.

A represents a bar of the harrow-frame, to which the teeth are'attached.B represents the harrow-tooth, made of a flat steel bar, and curvedsubstantially in the form shown. At the inner or upper end of the toothB is formed an eye, B, for the passage of a bolt, a, which pivots thetooth between two eyebolts, C C, said eyebolts being passed down fromthe top through the bar A and fastened by nuts b b.

D represents the spring, also made of flat steel, and curved in themanner shown. The inner end of this spring lies fiat on the bar A, underthe inner end of the tooth B, between the eyebolts O O, and it is heldfirmly in place by tightening the nuts I) on the ends of said eyebolts.

A bolt or screw, E, may be passed through the inner end of the springand the bar, for more securely holding the spring, if desired.

At this end of the spring is formed a flange, d, extending upward, andupon which the tooth rests. This flange is of great importance for manyreasons. It prevents the lodgment of any dirt between the tooth and thebar, which would otherwise change the position of the tooth sufficientlyin some cases to make a serious variation in the depth at which thetooth will Work. It also makes a space between the tooth and the barsufficiently large to render it easy to insert keys or wedges betweenthem when it is desired to raise the tooth more or less for the purposeof changing its working depth;

The spring D curves upward and rearward, and its free end rests upon thecurved portion of the tooth B, in such a manner that when the tooth israised the end of spring slides over the curved surface of the tooth.

The harrow tooth and spring thus constructed can be manufactured cheaperand lighter than in cases where the tooth and spring are all in onepiece.

Iron may sometimes be profitably substituted for steel in themanufacture of the tooth.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is- Y The combination of the harrowtooth B, hinged at its inner end, and the curved spring D, passed underthe end of the tooth, and formed with the flange d, substantially as andfor the purposes herein set forth. I

In testimonythat We claim the above wehave hereunto subscribed our namesin the presence of two witnesses.

DANIEL WATERBURY. FRANK MILLER.

Witnesses S. H. WATTLES, G. M. GATES.

